[nsp] MTU tricks for tunnels

[Temkin, David]

I'm working with an issue where we're load balancing traffic between a
GRE/IPSec tunnel and a DS-3, and the MTU mismatch between the two is
killing us - tcp-adjust-mss isn't that great of an option for us as the
traffic could stop going one direction and start going the other after
the session has started, which would then break it.  I know that I could
just up the MTU of the tunnel, however that punts all of the tunnel
traffic up to the process switching level, and I'm not prepared to deal
with that CPU hit.  

Has anyone come up with any tricks to get around the fact that Cisco
won't let you change the interface MTU on Fast Ethernet interfaces on
72xx's?

TIA,

David Temkin


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